AC
CALIBRATOR
hp
7454
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MULTIMETER
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Figure
5-4. AC Normal-Mode
Reiection
Test.
Model3490A
f.
Connect
jumper
across
I MQ resistor and
note
3490A
reading.
g.
Remove
jumper.
3490A
reading should change
between
000.908V
and
000.910V.
This verifies an
input resistance
of
10 MQ
x
O-15
%.
5-28.
AC VOLTMETEH
INPUT IMPEDANCE TEST.
5-29. A
test oscillator
(-hp
652A)
and
two precision
resistors,
I MO
t
O.l
%
(-hp-
06984369) and
l0 kQ
t
0.1 %
(-hp-
06984157),arc
required for
this test.
a. Connect
3490A, test oscillator, and
I Mfl resistor
(\)
as shown
in Figure
5-6. Connect
jumper
across
resistor as
indicated.
b. Set 349OA
FUNCTION to AC,
RANGE
to I V.
c. Adjust test
oscillator frequency to 25H2. Adjust
output
amplitude to
obtain a
3490A reading of
1.00000 v.
Section
V
d.
Remove
jumper
from resistor Rs. 3490A display
should
be not
less than
0.65975
V if
the
instrument
does
not
have
the
rear input connector,
or
not less
than
0.65804 if it does
have a
rear input connector in parallel
with the front input terminals.
e. Replace the l Mfl resistor
(R5)
with a l0k{-2
resistor. Connect
jumper
across resistor.
f. Adjust test oscillator frequency to
250 kHz. Ad-
just
output
amplitude for
3490A
reading of
1.00000
V.
g.
Remove
jumper
from lOkfl resistor.
3490A dis-
play
should
be not
less than
O.492ll
V
if
the 3490A
does
not
have rear
input connector,
or not
less than
0.41321
V
if it
does
have
the
rear
input.
$30. SAMPLE/HOLD
PERFORMANCE
(0ption
040/045).
--5-31.
The dc
voltage
meursurement
performance
of
the
3490A must be
within
specification before
proceeding
PERFOBMANGE
CHECKS
DC
STANDARD/
DIFFERENTIAL
VOLTMETE R
ho 74OB
MULTI METER
hp
349OA
3490A
B
-
2948
OUTPUT
CABLE
hp
llO558
Figure
5-5. DC Voltmeter Input
Resistance
Test.
5-5
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